JPH0972381A - Two-mass type fly wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacture and assembly of constitution of the first fly wheel of a two-mass type fly wheel. SOLUTION: A plate is used in a first fly wheel 5 and a pressing work of cylinder parts 15 and 16 and a flange 151 is applied on the inner peripheral side thereof. The outer wheel of a bearing 17 is fitted in the cylinder part 15 and fixed by means of a push plate 19 and a rivet 18 and since the inner ring of the bearing 17 is fixed at the hub 13 of a second wheel 14 by means of a C-ring 20, the inner ring of the bearing is held concentrically to the two fly wheel. Further, the cylinder part 16 is served as a support shaft for a friction coupling part 11 to support a disc 21 to be brought into dynamic friction and friction rings 22 and 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-mass type flywheel which is provided between a crankshaft of an engine and a transmission device and is used for smoothing vibration and rotation at low speed.

[0002]

2. Description of the Related Art A flywheel of this type is disclosed in, for example, Japanese Utility Model Laid-Open No. 52-22900, and the first flywheel and the second flywheel are fitted with members processed by cutting or grinding. Or it is assembled by polymerizing. However, with such a structure, the number of parts is large and the structure is complicated, and the processing means is not suitable for mass production, so that the workpiece must be expensive.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to form a first flywheel by press working so as to facilitate mass production.

[0004]

[Means for Solving the Problems] A first means for solving the above problems is that a spring is provided between a first flywheel and a second flywheel, as described in claim 1.
In a two-mass type flywheel in which both flywheels are concentrically supported by bearings, a bearing having an inner ring fitted to a hub of a second flyhole is provided, and an outer ring of the bearing is provided on an inner peripheral side of the first flywheel. A cylindrical portion surrounding the outer periphery of the first flange and a flange that abuts on one end surface of the outer ring are connected by press working, and a pressing plate that abuts on the other end surface of the outer ring is riveted to the first flywheel. With the configuration, the first flywheel and the second flywheel are held concentrically via the bearing.

The second means is, as described in claim 2, in claim 1, the cylindrical portion for supporting the friction coupling portion is connected to the outer side in the radial direction of the cylindrical portion surrounding the bearing by press working. It is characterized by having been provided, by this configuration, the tubular portion that serves as a support shaft of the friction coupling portion,
It can be formed at the same time as the cylindrical portion for the bearing.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is a two-mass type flywheel, and 2 is a drive plate thereof which is fixed to a crankshaft 4 of an engine by a bolt 3. 5 is a plate-shaped first flywheel which forms the main part of the first mass part, 6
Is a ring gear driven by a pinion and a starting motor (not shown) for starting the engine.

[0007] drive plate 2, are drilled bolt holes 2 ₂ with positioning projections 2 ₁ 2-4 point of the periphery close are provided, the first flywheel 5 positioning hole 5 ₁ and bolt holes 5 ₂ The ring gear 6 is provided with a positioning hole 6 ₁ and a screw hole 6 ₂ . Then, after positioning the three members, 2,5,6 fitted positioning projections 2 ₁ into the positioning holes 5 _1, 6 _1, is screwed into the screw hole 6 ₂ by inserting a bolt 7 into the bolt holes 5 ₂ Are fixed together.

On the side surface of the first flywheel 5 forming the first mass portion, a flange 30a formed on the outer peripheral side of a spring holding member 30 described later is superposed in a stepwise manner, and the joining surfaces of both members are welded. Welded all around by part 31
An oil chamber 32 is formed inside thereof.

The first flywheel 5 and the spring holding plate 30
Like other members, is made by pressing a thin plate in terms of workability, lightness, and economy, and the welded portion 31 is
Air tightness and strength must be sufficient for the pressure generated in the oil chamber 32.

However, since the first flywheel 5 and the spring holding plate 30 are thin plates and are stacked stepwise, it is difficult to perform airtight welding. However, in the present invention, a welding structure having a desired effect can be obtained by adopting a welding means for obliquely irradiating the joining surface with laser light by adopting laser welding.

The first flywheel 5 of the flywheel 1 is connected to the hub 13 via the friction connecting portion 11, the spring device 12, and the driven plate 33, and the hub 13 has a main portion of the second mass portion. The second flywheel 14 forming the is fixed. 13 ₁ is a screw hole for connecting the clutch, and 14 ₁ is a mass.

On the center side of the first flywheel 5, tubular portions 15 and 16 are provided in two stages by press working, a bearing 17 is held in the inner tubular portion 15, and the first flywheel 5 is It is supported by the hub 13 via a bearing 17. As means for holding the bearing 17, and clamped by the flange 15 ₁ and pushing plate 19 fixed by a rivet 18 extending the outer ring from the tubular portion 15, the stepped portion 1 of the inner ring hub 13
It is sandwiched 3 ₂ and C-ring 20.

The friction connecting portion 11 is fitted in the outer cylindrical portion 16 and has friction rings 22, 2 on both sides of the driven friction plate 21.
3, the friction ring 22 on one side is in contact with the first flywheel 5, and the friction ring 23 on the other side is the washer 2
4, the washer 24 has a disc spring 25 and a push plate 26.
Are sequentially stacked, the pressing plate 26 is fixed to the first flywheel 5 by the rivets 27, and the elastic force of the disc spring 25 acts on each contact surface. Further, since the claws 24 ₁ and 26 ₁ are provided on the outer circumferences of the washer 24 and the push plate 26 to be engaged with and locked to each other, the torque of the first flywheel 5 is transmitted by the friction plates 22 and 23 to the driven friction. It is transmitted to the plate 21.

As shown in FIG. 2, the driven friction plate 21 is provided with two types of U-shaped recesses 21 ₁ and 21 ₂ and a tongue 21 ₃ is formed between both recesses, and one recess 21 ₁ is provided. Weak spring 28
Is held, and the double strong spring 29 is held in the other recess 21 ₂ . The springs 28 and 29 are the spring device 1 in FIG.
2 is shown. 28 ₁ and 29 ₁ are spring seats fitted to both ends of each spring, and the spring seats 28 ₁ and 29 ₁ are tongue pieces 2 respectively.
Touch 1 ₃ .

Further, as is apparent from FIG. 1, the springs 28, 2
A spring holding plate 30 which covers one side of the spring 9 and holds the spring seats 28 ₁ and 29 ₁ in cooperation with the recesses 21 ₁ and 21 ₂ is welded to the first flywheel 5 at a welding portion 31. The spring holding plate 30 is provided with two pairs of inwardly facing step portions 30 ₁ and 30 ₁ , and the same step portion 3 is provided on the first flywheel 5 side.
0 ₁ is provided to hold the spring seat 29 ₁ of the strong spring 29 together with the recess 21 _{2 as} described above, and further the first flywheel 5 and the spring holding plate 30 form the oil chamber 32 for accommodating grease. It

Prior to the welding of the spring holding plate 30,
The driven plate 33 is welded to the hub 13. The driven plate 33 is provided with large and small U-shaped concave portions 33 ₁ , 33 _2.
3 are formed. Hub 13 integrated with this driven plate 33
Since the second flywheel 14 is welded to the second flywheel 14, the driven plate 33 also acts as a part of the mass of the second flywheel 14. An oil seal 34 closes the oil chamber 32.

When the friction driven plate 21 rotates in the direction of arrow A in FIG. 2, the pressure of the grease enclosed in the oil chamber 32 increases due to the centrifugal force and is increased toward the outer peripheral side. Leakage is prevented because the is sealed. At this time, the spring 29 is pushed in the direction of arrow A by the step portion 30 ₁ ,
The weak spring 28 immediately transmits torque to the tongue 33 ₃ of the driven plate 33, but the strong spring 29 does not come into contact with the tongue 33 ₃ and only the weak spring 28 is compressed. When the transmission torque further increases, the strong spring 29 contacts the tongue 33 ₃ and transmits the torque to the tongue 33 ₃ .

When the transmission torque fluctuates, the springs 28 and 29 expand and contract, the first flywheel 5 and the driven friction plate 21 move relative to each other, and a frictional resistance is generated in the friction connecting portion 11. The relative movement is accompanied by a change in torque. Acts as a reciprocating motion. When the relative movement is in the direction opposite to the arrow A, the action is opposite to that described above. Therefore, when the vibration rotation is transmitted, the vibration damping action due to the friction resistance occurs in addition to the buffer action due to the spring. The same effect occurs when compression is applied to the strong spring 29.

In this flywheel 1, the dynamic damping action of the first flywheel 5 and the second flywheel 14 is the same as the conventional one, but the friction coupling portion 1
Since the damping action of 1 is added, the damping action is increased.

The vibration damping action of this flywheel 1 is
It mainly occurs when the engine rotates at a low speed, and the frictional coupling portion 11
Damping action by the springs 28, 29, the buffer action by the springs 28, 29, the grease in the oil chamber 32 and the springs 28, 29, and the spring seats 28 ₁ , 2
9 ₁ viscosity resistance generated between the vibration is attenuated with the first flywheel 5 by the overlap of such dynamic damping action by the second flywheel 14.

[0021]

As is apparent from the above description, according to the first aspect of the present invention, the cylindrical portion and the flange are provided on the inner peripheral side of the first flywheel by press working, and the outer ring of the bearing is formed by these and the pressing plate. Since it is held, there is an advantage that steps such as cutting and caulking are unnecessary and processing and assembling are extremely easy.

Further, according to the means of claim 2, since the cylindrical portion supporting the friction coupling portion is connected by press working to the outside of the cylindrical portion supporting the outer ring of the bearing in the radial direction, both portions are simultaneously formed. It has the advantage that it can be pressed and can be produced very efficiently.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a flywheel embodying the present invention.

FIG. 2 is a front view of the same.

[Explanation of symbols]

2 Drive plate 5 1st flywheel 6 Ring gear 11 Friction connection part 12 Spring device 13 Hub 14 2nd flywheel 15,16 Cylindrical part 17 Flange part 21 Driven friction plate 23,23 Friction ring 30 Spring holding plate 30a Flange 31 Welding Part 32 Oil chamber 33 Driven plate

Claims (2)

[Claims] 1. A two-mass type flywheel in which a spring is interposed between a first flywheel and a second flywheel, and both flywheels are concentrically supported by bearings,
A bearing having an inner ring fitted to the hub of the second flyhole is provided, and a cylindrical portion surrounding the outer periphery of the outer ring of the bearing and a flange abutting on one end surface are connected by press working on the inner peripheral side of the first flywheel. A two-mass type flywheel, wherein a push plate that is provided and abuts against the other end surface of the outer ring is riveted to the first flywheel. 2. The flywheel of a two-mass type according to claim 1, wherein a tubular portion that supports the frictional coupling portion is connected by press working to the outside of the tubular portion that surrounds the bearing in the radial direction.